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<TITLE>JavaScript Source Code 3000:  Forms:  Validation (IP Address)</TITLE>
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<META NAME="description" CONTENT="Verify the value of an IP address.  Check for special cases such as "0.0.0.0" and "255.255.255.255".  Cool!">
<META NAME="date" CONTENT="2000-11-23">
<META NAME="channel" CONTENT="Web Developer">
<META NAME="author" CONTENT="Jay Bienvenu">
<META NAME="section" CONTENT="Forms">
<SCRIPT LANGUAGE="JavaScript">
<!-- Original:  Jay Bienvenu -->
<!-- Web Site:  http://www.bienvenu.net -->




<!-- Begin
function verifyIP (IPvalue) {
errorString = "";
theName = "IPaddress";

var ipPattern = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
var ipArray = IPvalue.match(ipPattern); 

if (IPvalue == "0.0.0.0")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
else if (IPvalue == "255.255.255.255")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
if (ipArray == null)
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
else {
for (i = 0; i < 4; i++) {
thisSegment = ipArray[i];
if (thisSegment > 255) {
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
i = 4;
}
if ((i == 0) && (thisSegment > 255)) {
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
i = 4;
      }
   }
}
extensionLength = 3;
if (errorString == "")
alert ("That is a valid IP address.");
else
alert (errorString);
}
//  End -->
</script>

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<FONT COLOR="#006666"><b>Validation (IP Address)</b></font></font>
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<!-- Description --><!--content_start-->
Verify the value of an IP address.  Check for special cases such as "0.0.0.0" and "255.255.255.255".  Cool!
<hr>
</td></tr>
</table>
<!-- Demonstration -->
<form>
IP Address:
<input size=15 name="IPvalue">
<input type="submit" value="Verify" onClick="verifyIP(IPvalue.value)";>
</form>
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<P>
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<table BORDER=0 WIDTH=486 CELLPADDING=3 CELLSPACING=0>
<tr><td BGCOLOR=yellow><font FACE="helvetica,arial,geneva"><b>JavaScript Source Code 3000:  Forms:  Validation (IP Address)</b>
<p>Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s).  The script is yours!!!
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<form NAME="copy">

<DIV align="center">
<input type=button value="Highlight All" onClick="javascript:this.form.txt.focus();this.form.txt.select();">&nbsp;&nbsp;&nbsp;&nbsp;
<INPUT TYPE="text" NAME="total" VALUE="Script Size:  1.91 KB" size=24>
</DIV>

<textarea NAME="txt" ROWS=20 COLS=75 WRAP=VIRTUAL>

&lt;!-- TWO STEPS TO INSTALL VALIDATION (IP ADDRESS):

  1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  --&gt;

&lt;!-- STEP ONE: Paste this code into the HEAD of your HTML document  --&gt;

&lt;HEAD&gt;

&lt;SCRIPT LANGUAGE="JavaScript"&gt;
&lt;!-- Original:  Jay Bienvenu --&gt;
&lt;!-- Web Site:  http://www.bienvenu.net --&gt;

&lt;! &gt;
&lt;! &gt;

&lt;!-- Begin
function verifyIP (IPvalue) {
errorString = "";
theName = "IPaddress";

var ipPattern = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
var ipArray = IPvalue.match(ipPattern); 

if (IPvalue == "0.0.0.0")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
else if (IPvalue == "255.255.255.255")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
if (ipArray == null)
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
else {
for (i = 0; i &lt; 4; i++) {
thisSegment = ipArray[i];
if (thisSegment &gt; 255) {
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
i = 4;
}
if ((i == 0) && (thisSegment &gt; 255)) {
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
i = 4;
      }
   }
}
extensionLength = 3;
if (errorString == "")
alert ("That is a valid IP address.");
else
alert (errorString);
}
//  End --&gt;
&lt;/script&gt;

&lt;/HEAD&gt;

&lt;!-- STEP TWO: Copy this code into the BODY of your HTML document  --&gt;

&lt;BODY&gt;

&lt;form&gt;
IP Address:
&lt;input size=15 name="IPvalue"&gt;
&lt;input type="submit" value="Verify" onClick="verifyIP(IPvalue.value)";&gt;
&lt;/form&gt;

 

&lt;!-- Script Size:  1.91 KB --&gt;</textarea><br><font FACE="helvetica,arial,geneva"></font></td></tr>

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</form>
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